---
id: CVE-2026-19203
title: >-
  A client may issue specially crafted HTTP/1.1 chunked requests to a Jetty
  server that cause Jetty and an intermediary proxy to interpret different
  request boundaries, potentially resulting in HTTP request smuggling.





  This is caused by…
summary: >-
  A client may issue specially crafted HTTP/1.1 chunked requests to a Jetty
  server that cause Jetty and an intermediary proxy to interpret different
  request boundaries, potentially resulting in HTTP request smuggling.





  This is caused by…
severity: high
cvss: 8.3
cvssVector: 'CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:L/VI:H/VA:N/SC:N/SI:N/SA:N'
cwe:
  - CWE-444
vendor: Eclipse Foundation
product: Eclipse Jetty
affected:
  - eclipse_jetty >= 12.1.0 <= 12.1.11
  - eclipse_jetty >= 12.0.0 <= 12.0.37
  - eclipse_jetty >= 11.0.0 <= 11.0.31
  - eclipse_jetty >= 10.0.0 <= 10.0.31
  - eclipse_jetty >= 9.4.0 <= 9.4.63
published: '2026-09-08'
updated: '2026-09-08'
sourceUpdated: '2026-09-08T15:18:42.667'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-19203'
references:
  - url: >-
      https://github.com/jetty/jetty.project/security/advisories/GHSA-xc35-c22g-239h
    label: emo@eclipse.org
  - url: >-
      https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-19203.json
  - url: 'https://access.redhat.com/security/cve/CVE-2026-19203'
  - url: 'https://bugzilla.redhat.com/show_bug.cgi?id=2529768'
  - url: 'https://www.cve.org/CVERecord?id=CVE-2026-19203'
  - url: 'https://nvd.nist.gov/vuln/detail/CVE-2026-19203'
tags:
  - nvd
  - cve.org
  - csaf
  - vex
  - red-hat
ssvc:
  exploitation: none
  automatable: 'no'
  technicalImpact: partial
  timestamp: '2026-09-08T14:21:37.718183Z'
cvssSource: cna
ingestedAt: '2026-09-08T15:33:26.984Z'
epss: 0.00306
epssPercentile: 0.20702
scores:
  cna: 8.3
  vendor: 8.2
---

## Overview

A client may issue specially crafted HTTP/1.1 chunked requests to a Jetty server that cause Jetty and an intermediary proxy to interpret different request boundaries, potentially resulting in HTTP request smuggling.




This is caused by Jetty accepting a lone LF character as a terminator in parts of chunked request parsing. Depending on the Jetty version and configured HTTP compliance mode, this may occur in chunk extensions, chunk data termination, or trailer termination.

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.

## Vendor advisories

- **Red Hat VEX** · Important · affected: Exploit Intelligence, OpenShift Developer Tools and Services, Red Hat AMQ Broker 7, Red Hat build of Apache Camel - HawtIO 4, Red Hat build of Apache Camel 4 for Quarkus 3, Red Hat build of Apache Camel for Spring Boot 4, … · no fix planned: Red Hat OpenStack Platform 13 (Queens), Exploit Intelligence, OpenShift Developer Tools and Services, Red Hat AMQ Broker 7, … · updated 2026-09-24 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-19203.json)